*{
    padding: 0;
    margin:0;
}
.BhTeacher{
    width: 100%;
    height: 120px;
}
.biliVdo{
    width: 100%;
    height: auto;
    float: left;
}
.BhUserHead{
    width: 6%;
    height: 12%;
    position: absolute;
    top: 12%;
    background-color: aqua;
    border-radius: 100%;
    left: 47.5%;
}
.BhSyGn{
    width: 98%;
    height: 800px;
    position: absolute;
    /* background-color: antiquewhite; */
    z-index: -1;
    left: 1%;
    top: 20%;
    border: 1px solid black;
    border-bottom: none;
}
.BhSyGnLeft_Gn{
    float: left;
    width: 9%;
    height: 100%;
    background-color: #d2d2d2;
}
.BhSyGnLeft_Gn ul{
    width: 100%;
    list-style: none;
    height: 100%;
}
.BhSyGnLeft_Gn ul li{
    font-size: 18px;
    float: left;
    width: 100%;
    height: 7%;
    text-align: center;
    background-color: #7dc9cb;
}
.BhSyGnLeft_Gn ul li p{
    word-wrap: anywhere;
    margin-top: 8%;
    color: white;
}
.BhSyGnRight_Gn{
    float: left;
    width: 91%;
    height: 100%;
}
#BhSyRight_if{
    width: 100%;
    height: 100%;
    border:none;
}
.iframe_lay{
    width: 100%;
    height: 86%;
}